<template>
  <div class="tags-view-container">
    <jt-scroll-pane class='tags-view-wrapper' ref='JtScrollPane'>
      <router-link ref='tag' class="tags-view-item" :class="isActive(tag)?'active':''" v-for="tag in Array.from(visitedViews)"
        :to="tag.path" :key="tag.path" @contextmenu.prevent.native="openMenu(tag,$event)">
        {{tag.title}}
        <span class='el-icon-close' @click.prevent.stop='closeSelectedTag(tag)'></span>
      </router-link>
    </jt-scroll-pane>
    <ul class='contextmenu' v-show="visible" :style="{left:left+'px',top:top+'px'}">
      <li @click="closeSelectedTag(selectedTag)">关闭</li>
      <li @click="closeOthersTags">关闭其他</li>
      <!-- <li @click="closeAllTags">关闭所有</li> -->
    </ul>
  </div>
</template>

<script>
import JtScrollPane from '../jt-scroll-pane/index';
export default {
  components: { 
    'jt-scroll-pane':JtScrollPane
  },
  data() {
    return {
      visible: false,
      top: 0,
      left: 0,
      selectedTag: {}
    }
  },
  computed: {
    visitedViews() {
      return this.$store.state.tagsView.visitedViews
    }
  },
  watch: {
    $route() {
      this.addViewTags()
      this.moveToCurrentTag()
    },
    visible(value) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu)
      } else {
        document.body.removeEventListener('click', this.closeMenu)
      }
    }
  },
  mounted() {
    this.addViewTags()
  },
  methods: {
    generateRoute() {
      if (this.$route.name) {
        return this.$route
      }
      return false
    },
    isActive(route) {
      return route.path === this.$route.path || route.name === this.$route.name
    },
    addViewTags() {
      const route = this.generateRoute()
      if (!route) {
        return false
      }
      this.$store.dispatch('addVisitedViews', route)
    },
    moveToCurrentTag() {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to === this.$route.path) {
            this.$refs.JtScrollPane.moveToTarget(tag.$el)
            break
          }
        }
      })
    },
    closeSelectedTag(view) {
      this.$store.dispatch('delVisitedViews', view).then((views) => {
        if (this.isActive(view)) {
          const latestView = views.slice(-1)[0]
          if (latestView) {
            this.$router.push(latestView.path)
          } else {
            this.$router.push('/main/abstract')
          }
        }
      })
    },
    closeOthersTags() {
      this.$router.push(this.selectedTag.path)
      this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
        this.moveToCurrentTag()
      })
    },
    closeAllTags() {
      this.$store.dispatch('delAllViews')
      this.$router.push('/')
    },
    openMenu(tag, e) {
      this.visible = true
      this.selectedTag = tag
      this.left = e.clientX
      this.top = e.clientY
    },
    closeMenu() {
      this.visible = false
    }
  }
}
</script>

<style scoped>
.tags-view-container .tags-view-wrapper {
  background: #fff;
  height: 34px;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);
}
.tags-view-container .tags-view-wrapper .tags-view-item {
  display: inline-block;
  position: relative;
  height: 26px;
  line-height: 26px;
  border: 1px solid #d8dce5;
  color: #495060;
  background: #fff;
  padding: 0 8px;
  font-size: 12px;
  margin-left: 5px;
  margin-top: 4px;
}
.tags-view-container .tags-view-wrapper .tags-view-item:first-of-type {
  margin-left: 15px;
}
.tags-view-container .tags-view-wrapper .tags-view-item.active {
  background-color: #029af4;
  color: #fff;
  border-color: #029af4;
}
.tags-view-container .tags-view-wrapper .tags-view-item.active::before {
  content: "";
  background: #fff;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  position: relative;
  margin-right: 2px;
}
.tags-view-container .contextmenu {
  margin: 0;
  background: #fff;
  z-index: 100;
  position: absolute;
  list-style-type: none;
  padding: 5px 0;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 400;
  color: #333;
  box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
}
.tags-view-container .contextmenu li {
  margin: 0;
  padding: 7px 16px;
  cursor: pointer;
}
.tags-view-container .contextmenu li:hover {
  background: #eee;
}
</style>

<style>
.tags-view-wrapper .tags-view-item .el-icon-close {
  width: 16px;
  height: 16px;
  vertical-align: 2px;
  border-radius: 50%;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform-origin: 100% 50%;
}
.tags-view-wrapper .tags-view-item .el-icon-close:before {
  transform: scale(0.6);
  display: inline-block;
  vertical-align: -3px;
}
.tags-view-wrapper .tags-view-item .el-icon-close:hover {
  background-color: #b4bccc;
  color: #fff;
}
</style>

